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A Ge specimen is dopped with Al. The con...

A `Ge` specimen is dopped with `Al`. The concentration of acceptor atoms is `~10^(21) at oms//m^(3)`. Given that the intrinsic concentration of electron hole pairs is `~10^(19)//m^(3)`, the concentration of electron in the speciman is

A

`10^2//m^3`

B

`10^17//m^3`

C

`10^4//m^3`

D

`10^15//m^3`.

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